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  <h1 class="title">简介</h1>
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   The PECL/rrd extension provides bindings to the RRDtool C library.
   RRDtool is the open source industry standard, high performance data
   logging and graphing system for time series data.
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   The RRDtool homepage is <a href="http://www.mrtg.org/rrdtool/" class="link external">&raquo;&nbsp;http://www.mrtg.org/rrdtool/</a>.
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